You need to keep an eye on the tricones
If flushing two weeks prior to harvest, you should begin when you start seeing the first trichomes turn milky.
If you are growing Indica hybrids, it is better to harvest your plants when the resin glands are completely developed but not fully ripen, before they turn amber .
unless you like being glued to your couch.
i would start to flush with ph water last 2 weeks when tricones are milky
The last 4th day i flush each pot until the run off ppm or ec is at almost nothing.. if you don't have a meter just flush until the run off water is clear
You should have 50% amber tricones by now ...
Have fun curing !!